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I have the honour to enclose you an original paper "On the Rio Negro", by Alfred R. Wallace, accompanied by an original map, which I am desirous to submit to the notice of the Royal Geographical Society.

In these documents we are made better acquainted with a region very imperfectly known, and the features of that magnificent river the Rio Negro, are well described. That river The physical development of that river, its2[[2]] great breadth, its intricate labyrinth of innumerable islands, - is probably not exceeded[?] by any other River in the World.

The River Vaupes, considered to be the headstream of the Rio Negro, never before explored by Europeans, is now for the first time delineated in the map by Mr. Wallace.

I have the honour to be | Sir | your obedient Servant | A Petermann [signature]

ENDNOTES

1. The paper has a letter head with a picture of a globe and the text "Physical Geographer to the Queen".

2. Below the main text of the letter is the text "To the secretary of the Royal Geographical Society".

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